~alan-griffiths/mir/fix-1716436

Remove even more manual reference counting of mg::Buffer-s. .

Approved by mir-ci-bot, Alan Griffiths, Brandon Schaefer.

added added

removed removed

~MultiMonitorArbiter();

std::shared_ptr<graphics::Buffer> compositor_acquire(compositor::CompositorID id) override;

void compositor_release(std::shared_ptr<graphics::Buffer> const&) override;

std::shared_ptr<graphics::Buffer> snapshot_acquire() override;

void snapshot_release(std::shared_ptr<graphics::Buffer> const&) override;

void set_schedule(std::shared_ptr<Schedule> const& schedule);

bool buffer_ready_for(compositor::CompositorID id);

bool has_buffer();

void advance_schedule();

private:

void decrease_refcount_for(graphics::BufferID id, std::lock_guard<std::mutex> const&);

void clean_onscreen_buffers(std::lock_guard<std::mutex> const&);

std::mutex mutable mutex;

struct ScheduleEntry

{

ScheduleEntry(std::shared_ptr<graphics::Buffer> const& buffer, unsigned int use_count) :

buffer(buffer),

use_count(use_count)

{

}

std::shared_ptr<graphics::Buffer> buffer;

unsigned int use_count;

};

std::deque<ScheduleEntry> onscreen_buffers;

std::shared_ptr<graphics::Buffer> current_buffer;

std::set<compositor::CompositorID> current_buffer_users;

std::shared_ptr<Schedule> schedule;

};